Utterly random hypothesis: your odd inability to learn is caused by the tension between intrinsic and extrinsic motivation. You got into programming and learned stuff because it was fun in itself, but when you started thinking that you should use your skills to earn money and started analyzing every programming-related action in terms of its money-earning potential, it stopped being fun and became ugh.

Then my advice is this: talk to someone who has the entry-level job you want and ask him or her what skills he/she needs to do it and what skills whoever hired him or her thinks one needs. Then learn them. As for the "oddly unable" thing, I suggest reflecting on how you learned what you are good at in the first place. If there's anything different about your current, ineffective approach to learning new techniques stop doing it. Unless you've recently suffered brain trauma, it's likely just some weird ugh field-like effect.